More than 250 people have moved from Google and related firms to the federal government or vice versa since President Barack Obama took office.

The Google Transparency Project, the work of Campaign for Accountability, poured over reams of data to find 258 instances of “revolving door activity” between Google or its associated companies and the federal government, national political campaigns and Congress since 2009.

Much of that revolving door activity took place at 1600 Pennsylvania Avenue, where 22 former White House officials went to work for Google and 31 executives from Google and related firms went to work at the White House or were appointed to federal advisory boards by Obama. Those boards include the President’s Council on Science and Technology and the President’s Council on Jobs and Competitiveness.

Regulation watchdogs may be just as keen about the moves between Google and the Federal Communications Commission and Federal Trade Commission. Those government bodies regulate many of the programs that are at the heart of Google’s business, and there have been at least 15 moves between Google and its lobbying firms and those commissions.